As mentioned above highlight a number of flux-cored welding favorable characteristics, such as playing with some flux coated electrode can improve the filler metal chemical composition and mechanical properties of the function. Have on production efficiency gas metal arc welding and submerged arc welding characteristics.

Flux-cored wire for carbon steel, low alloy high tensile steel, high strength quenched and tempered steel, stainless steel and wear-resistant steel and other hard surface welding.

FCW is a promising new type of welding material, made in recent years, increasing the amount of variety and Flux Cored Welding Wire. Compared with the solid flux-cored wire has the following advantages and disadvantages.

(1) Advantages:

1) The welding of various steel products, adaptable to adjust the composition and flux ratio is very convenient and easy, can provide the required chemical composition of the weld.

2) process performance, using gas forming beautiful candle residue seam joint protection, get a good shape. Stabilizing agent added to the arc-arc stability, metal transfer evenly.

3) The deposition speed, high efficiency under the same flux-cored welding current the current density, melting fast, the deposition rate of about 85% -90% higher productivity than the welding arc about 3-5 times.

4) The welding current can be larger all-position welding.

(2) shortcomings

1) wire manufacturing process is complex

2) When welding, wire feed problems than solid wire

3) the appearance of easily corroded wire, powder easily to absorb moisture, so keep a flux cored wire management requirements more stringent

3.1, the function played by flux components:

With the same electrode coating, flux cored wire manufacturers of the ingredients are its unique formula, with different functions applicable welding, flux components, which are also different.

The basic function of flux components outlined below:

(1) In addition to nitrogen and oxygen scavenger agent

As the nitrogen and oxygen can cause holes or weld metal embrittlement, flux must be added to manganese and silicon, oxygen scavenger, as self-shielded flux cored wire, flux in the AL to the other need to add nitrogen removal agent. Adding more oxygen than nitrogen agents and cleaning agents aimed at the filler metal.

(2) welding slag-forming agent

Calcium, potassium, sodium or silicon are welding slag-forming agent, added to the flux can effectively protect the weld pool from atmospheric contamination, welding slag, welding props can make a better appearance and rapid cooling after welding can support full-time position the pool. Slag welding filler metal covering more ease the cooling rate, this feature is particularly important for low alloy steel welding.

(3) arc stabilizer

Sodium and potassium can also lower the arc to maintain smooth soft splash.

(4) alloying elements

Molybdenum, chromium, carbon, manganese, nickel and vanadium alloying elements such as add, can increase (improvement) filler metal strength, ductility, hardness and toughness.

(5) gas-forming agent

Fluorspar, limestone, etc. need to add in the Types Of Welding Wires manipulation to protect the combustion gases.

3.2 the type of welding slag

Flux components of the decision of welding consumables and welding filler metal operating mechanical, flux components in terms of acid-based, acid generated after welding welding slag, similar to alkaline (calcareous) will produce alkaline-based solder flux slag. Welding consumables acid system is very good, smooth and stable arc welding process, arc shape similar to the jet, flying less, welding personnel operating on the wide favorite, filler metal mechanical common but up to AWS specifications.

The welding flux as the basic system filler metal can get very good ductility and toughness, but the operation of the system worse than acidic. Droplet transition than the transition to the main ball drop, splash more.

In recent years, low alloy steel welding flux system development combines the operations of the Department of acidic and alkaline series of fine mechanical